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Wash down the surfaces to be painted with a wall cleaner such as trisodium phosphate (TSP) or TSP substitute. This will remove any grease or dirt and will "rough up" any glossy paint already on the walls so that new paint will adhere well. Wear latex gloves and work in a well-ventilated area when using TSP or TSP substitute.
Once the walls are cleaned and dry, prime and paint as desired.
Prime the surface as before, and make sure to choose a paint that’s designed for floor use. Work from a far corner of the floor toward the doorway to avoid getting painted into a corner.
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